HAMILTON, Ohio -- Two twin brothers operating as doctors in Butler County, Ohio, repeatedly had sex with male patients who were minors, authorities allege.

Authorities alleged in a Common Pleas Court records that Mark and Scott Blankenburg, both 53, engaged in sexual acts with young male patients starting in the 1980s, using prescriptions drugs or money as payment, The Cincinnati Enquirer reported Thursday.

Mark Blankenburg is facing a total of 54 charges ranging including committing sex acts with minors in relation to the alleged illicit activities.

His brother, Scott, is facing 22 total charges including bribery and compelling prostitution. Scott Blankenburg isn't facing any drug charges in the criminal matter.

Both of the brothers, who are also facing child pornography charges, have pleaded innocent to all charges. The child pornography charges stem from pornographic photographs allegedly found in the brothers' home in Hamilton, Ohio.

Four victims have accused Mark Blankenburg of the crimes, while Scott Blankenburg stands accused of molesting two young males, the Enquirer said.